Harlan Wheatley stated that BT rye was already being blended into the VWFRR, perhaps as early as 2012, but certainly last year. Take it for what it is worth. No indication given of the percentages but BT has almost certainly been making rye since before 2004. Handy has been around since 2006 and that one was distilled in 1998 so easily could have 13yo+ rye on hand. Seems reasonable as that would pretty much match up with 2012/2013.
I have a C from 2012 and a D from 2013 but haven't tried the D yet.